Reno:
As to your comments about a handy box, or a switch box. What is lacking somewhere with some guys is either good old common sense, or experience.
The issues with some devices having 'larger cube capacity' than others should be somehow written into the box fill calcs. I remember back in time trying really hard to install GFI devices as replacements for old 2 wire recepts. The guy I worked for insisted that they 'will fit'
Solution back the was a single gang 'wiremold' extension box. Customers didn't like it, but....
Keep the faith
